As promised, here is the second option for the big boy bed (Ikea Kura bed hack). Option 1 or Option Pers.
Love this little boys room - ORDER a custom colored Garland from Northern Cottage
The perfect IKEA montessori bed — La Tela di Carlotta (english) — Medium
From Outstanding to Easy: 20 DIY Toddler Beds
Clear outward facing book shelves Pretty Melbourne Home
Looking for a one-of-a-kind toddler bed? These creative IKEA hacks, featuring the toddler-friendly and amazingly versatile "KURA," will blow your mind!: Cuddle-Up Club House
Shared room with 4 boys
Love this minus the giraffe head! Domino magazine photograph's Stone Fox Bride owner Molly Guy's Brooklyn apartment and children's room, featuring a lofted bed and play space, a kids tipi, moroccan pouf, and shag rug.